Paint for preventing surface reflection

Abstract

The surface reflection is prevented by application of a black paint to an element such as a unit or parts forming an optical system, in particular an inner face of a camera lens tube portion and the end face portion of a lens, or the like. Application of the black paint to the element leads to the formation of a black coating film of from 0.35% to 0.7% that is an extremely low reflectance onto a surface of the element in a wide-ranging wavelength region from 380 nm to 780 nm, regardless of the material thereof.

1 . A method of antireflection treatment for preventing surface reflection, comprising applying a black paint to a surface of an element, wherein
 a black coating film exhibiting an extremely low reflectance of from 0.35% to 0.7% is formed in a wide-ranging wavelength region of from 380 nm to 780 nm, by applying the black paint to the surface of the element, regardless of materials thereof.   
   
   
       2 . The method according to  claim 1 , wherein
 a base of the black paint is an acrylic resin, and wherein carbon black is added as an additive.   
   
   
       3 . The method according to  claim 1 , wherein
 a base of the black paint is a modified vinyl acetate resin, and wherein carbon black is added as an additive.   
   
   
       4 . The method according to  claim 1 , wherein
 a base of a black paint is a specific alkyd-melamine resin, and wherein   carbon black is added as an additive.   
   
   
       5 . The method according to  claim 1 , wherein
 a base of a black paint is a maleic anhydride acrylic modified polyolefin resin and wherein   carbon black is added as an additive.   
   
   
       6 . Use of a black paint for preventing surface reflection. 
   
   
       7 . The use as defined in  claim 6 , wherein the black paint is provided on a surface of an element so that a black coating film exhibiting an extremely low reflectance of from 0.35% to 0.7% is formed on the surface of the element, in a wide-ranging wavelength region of from 380 nm to 780 nm, regardless of materials thereof. 
   
   
       8 . The use according to  claim 6 , wherein
 a base of the black paint is an acrylic resin and wherein carbon black is added as an additive.   
   
   
       9 . The use according to  claim 6 , wherein
 a base of a black paint is a modified vinyl acetate resin and wherein carbon black is added as an additive.   
   
   
       10 . The use according to  claim 6 , wherein
 a base of a black paint is a specific alkyd-melamine resin and wherein carbon black is added as an additive.   
   
   
       11 . The use according to  claim 6 , wherein
 a base of a black paint is a maleic anhydride acrylic modified polyolefin resin and wherein carbon black is added as an additive.